Snow skates
A snow skate is disclosed which provides improved control and skate-like performance, particularly on hard-pack or icy surfaces. The snow skate has edges which increasingly project from the central flat region of the ski to the forward area. Preferably this is achieved by making the base increasingly concave forward and rearward from a central generally flat region.
1. Field of the Invention
The invention relates to the field of equipment for descending snow-covered slopes, and more particularly to the design and construction of snow skates.
2. Description of the Related Art
Conventional snow skis have a length typically greater than 1 meter. Short skis from 60 to 100 cm. referred to as “skiboards”, SNOW-BLADES™ or Big Foot™ skis are popular as a novelty for skiers who wish to retain the skiing experience but with a more easily maneuverable ski. They tend to be difficult to control in hard or icy conditions. As well, skiboards are unstable at speed when ridden flat due to their sidecut. Further, they do not attempt to emulate the performance of ice skates which allow a user to both track a straight line or arcs of varying radii, turn and stop sharply or accelerate on a hard surface.
Many attempts have been made at designing snow skates which are not much longer than the user's foot. U.S. Pat. No. 1,802,116 to Kinsley discloses a snow skate having a length comparable to a roller skate for use on snow or ice and having a runner with beaded edges and a central guide. On snow the skate runs on the full lower surface of the runner while on ice it rides on the beaded edges. French patent no. 1,071,142 issued Mar. 3, 1954 to Henrich discloses a ski from 50 to 65 cm. in length for use on ice-fields, glaciers and the like and having downwardly projecting metal edges extending along either edge thereof. U.S. Pat. No. 3,295,859 to Perry discloses a metal ski of about 91.5 cm. in length having grooves along the bottom of either lateral edge. U.S. Pat. No. 4,188,046 to Fleckenstein discloses a plastic ski of about 51 cm. in length with a flat base and no metal edges for use in trick skiing. U.S. Pat. No. 4,705,291 to Gauer discloses a short ski of about 80 cm. in length in which the base is substantially convex from front to rear and from side to side for ease of pivoting and spinning.
One problem with prior snow skates is that they do not provide adequate control for the skier on hard or icy surfaces as well as soft surfaces. There is therefore a need for a pair of snow skates which has good handling characteristics on such surfaces and can combine the performance characteristics of ice skates on hard surfaces with the performance of skis on soft snowy surfaces of varying inclination.
BRIEF SUMMARY OF THE INVENTIONThe invention therefore provides a snow skate, having an elongated ski body having an upturned front end and a rear end, one embodiment of the snow skate comprising: a) an upper surface adapted to receive a boot binding for releasably securing a boot to the upper surface intermediate said front and rear ends; b) a base surface having a central, generally flat zone and a zone of increased edge projection forward of the flat zone; and c) longitudinal edges extending along opposed sides of said base surface; wherein the depth of said edges below said base increases continuously from said flat zone towards said zone of increased edge projection.
In particular embodiments, the base surface further comprises a second zone of increased edge projection rearward of the flat zone and the depth of the edge elements below the base increases continuously from the flat zone towards the second zone of increased edge projection.
According to another embodiment of the invention, there is provided a snow skate, having an elongated ski body having an upturned front end and a rear end, the ski body in this embodiment comprising: a) an upper surface adapted to receive a boot binding for releasably securing a boot to the upper surface intermediate the front and rear ends; b) a base surface having a central, generally flat zone and a zone of increased edge projection forward of the flat zone; and c) longitudinal edges extending along opposed sides of the base surface; wherein the transverse concavity of the base increases continuously from the flat zone towards the zone of increased edge projection.
In particular embodiments, the base surface further comprises a second zone of increased edge projection rearward of the flat zone and the transverse concavity of the base increases continuously from the flat zone towards the second zone of increased edge projection.
The edges can be rockered over the length of the snow skate.
In drawings, which illustrate selected embodiments of the invention:
Throughout the following description, specific details are set forth in order to provide a more thorough understanding of the invention. However, the invention may be practiced without all of these particulars. In other instances, well known elements have not been shown or described in detail to avoid unnecessarily obscuring the invention. Accordingly, the specification and drawings are to be regarded in an illustrative, rather than a restrictive, sense.
With reference to
Contour lines 32 in
In its simplest embodiment, as shown in
In a further embodiment, as shown in
In a further embodiment, as shown in
In a further embodiment, as shown in
While the invention will work also if the increase in concavity, projection or depth of the edges or effective “bite” of the base is only present forward of the central flat zone, it is preferred to have this increase in base concavity, projection or depth of the edges in both forward and rearward directions. This avoids a tendency to pivot and generally provides better tracking and greater control for the user.
The snow skate ski 12 of the invention can be manufactured using modified existing snowboard/ski manufacturing methods and materials. For use on ski hills, it may be preferable to produce the snow skate as a steel-edged, strong, lightweight construction able to mount to most snowboard bindings. Steam-bent, laminated wood strips (e.g., ash), drilled to accept stainless steel T-nut snowboard binding inserts in the standard 4×4 cm pattern, can be used to make the core of the snow skate; this can then be milled to shape for fixing/bonding the carbon steel edge strips, the core then covered/wrapped by reinforcing fiberglass cloth layers in an epoxy resin matrix; a protective cosmetic top sheet and a low-friction base surface layer. Manufacturing processes such as matched die heat/compression molding, or resin transfer molding may be used; synthetic fiber (e.g., fiberglass; carbon fiber; Kevlar™) cloth and epoxy, or epoxy pre-preg layers, can be used in the lay-up over a central core of laminated wood strips or a honeycomb material as in a structural sandwich construction; a molded rim construction, involving injecting a suitable synthetic resin around a wood core, may also be used as illustrated in
In another embodiment, the snow skates could be made using two sheets of steel or other suitable metal (e.g., aluminum; titanium) or alloy stamped out or otherwise formed to shape, or advanced composite pre-pregs or fiber-reinforced thermoplastic sheets or another suitably formable sheet material could be heat/compression molded or vacuum molded to form the top and base surfaces; the top and bottom surfaces can then be welded, tightly bonded, or otherwise fastened together to form the ski 12 of the invention. Exothermically expanded polyurethane foam/a foaming synthetic resin can be injected, or a similarly suitable core filler can be used, to solidify the gaps between the flat upper surface and the complex curvature of the base surface sheet or otherwise between the laminated layers of the construction. A drilled or punched reinforcing sheet or plate of a suitable rigid material, to receive the T-nut inserts and further prevent them from being ripped out under stress, can also be added during the construction.
In another embodiment, a single structural sheet of steel or other suitable material can be stamp-molded, or otherwise shaped to form the increasingly narrow and exposed and vertical side edges fore and rearward of the central flat zone. Once the stainless steel T-nut inserts for mounting snowboard bindings are in place in drilled/punched holes of the sheet, a molded base surface of suitable thermoplastic/thermoset material can be joined to the sheet so as to form the base surface shape, and then covered with, or else already having, a suitable ultra low-friction base surface for sliding; or a resilient, hard material can be joined to the sheet to develop the base to edge transition, as shown in
In further embodiments, a simple rockered base, which is generally flat (and may be slightly concave) from side to side, can be given the varying degree of edge projection necessary for the invention by varying the width of the mounted side edges; or varying the mounting position of an edge strip of a given width; or varying the angle at which the side edge strips are mounted; or the snow skates' thickness can be varied using side edge strips of a given width to achieve the edge prominence required for varying degrees of bite into the snow; or a combination of the above. Such side edge strips can further vary in the angle at which they are mounted in the bite zone, from a vertical orientation down to 45 degrees, and still provide adequate bite into the snow to thereby provide the required degree of vertical edge penetration into the snowy ground, relative to the resting base surface contour along the length of the skate, to perform as desired by the user.
The vertical or otherwise inclined steel edges may be screwed, laminated, or tightly bonded to the snow skates, or joined as an insert during an exothermic thermoset/advanced composites/engineered resin molding process. The edges could also be suitably made from inset, resilient, hardened material forming the side walls 22 and/or running edges of the base surface (shown in
Thus concentrating the weight of the user more towards the central flat zone of the base permits side slippage, pivoting, spinning or turning backwards. Concentrating the weight of the user on the front (or rear) bite zones allows the user to carve turns, brake, stop or perform a skating motion in which the user alternately forces off the inside edge of each ski in the area of the bite zone to obtain acceleration. Stopping can be achieved either using a sideways hockey stop or snowplow motion while going forwards or a reverse snowplow going backwards.
All of the above U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications and non-patent publications referred to in this specification and/or listed in the Application Data Sheet, are incorporated herein by reference, in their entirety.
As will be apparent to those skilled in the art in the light of the foregoing disclosure, many alterations and modifications are possible in the practice of this invention without departing from the spirit or scope thereof. For example, features of specific variants shown in the drawings may be combined with specific features of other variants to produce a snow skate with the desired combination of side slipping and biting characteristics. Accordingly, the scope of the invention is to be construed in accordance with the substance defined by the following claims.
Claims
1. A snow skate, comprising an elongated ski body having an upturned front end and a rear end, said ski body comprising:
- a) an upper surface adapted to receive a boot binding for releasably securing a boot to said upper surface intermediate said front and rear ends;
- b) a base surface having a central generally flat zone and a first zone of increased edge projection forward of said flat zone; and
- c) longitudinal edges extending along opposed sides of said base surface;
- wherein the depth of said edges below said base increases continuously from said flat zone towards said zone of increased edge projection forward of said flat zone wherein said base surface further comprises a second zone of increased edge projection rearward of said flat zone and the depth of said edges below said base increases continuously from said flat zone towards said second zone of increased edge projection.
2. A snow skate, comprising an elongated ski body having an upturned front end and a rear end, said ski body comprising:
- a) an upper surface adapted to receive a boot binding for releasably securing a boot to said upper surface intermediate said front and rear ends;
- b) a base surface having a central generally flat zone and a first zone of increased edge projection forward of said flat zone; and
- c) longitudinal edges extending along opposed sides of said base surface;
- wherein the transverse concavity of said base increases continuously from said flat zone towards said zone of increased edge projection wherein said base surface further comprises a second zone of increased edge projection rearward of said flat zone and the transverse concavity of said base increases continuously from said flat zone towards said second zone of increased edge projection.
3. The snow skate of claim 1 or 2 wherein said base surface is slightly concave in transverse cross-section in said flat zone.
4. The snow skate of claim 1 or 2 wherein said edges project slightly below said base surface in transverse cross-section in said flat zone.
5. The snow skate of claim 1 or 2 wherein said edges have a rocker curvature longitudinally.
6. The snow skate of claim 1 or 2 wherein said base surface has a central convex ridge running longitudinally through said flat zone.
7. The snow skate of claim 1 wherein said first zone of increased edge projection lies generally below the ball of a user's foot when the snow skate is in use.
8. The snow skate of claim 1 wherein the length of said ski body is not significantly greater than the length of the user's boot.
9. The snow skate of claim 1 wherein said rear end is upturned.
10. The snow skate of claim 1 wherein said base comprises a transverse passage sized and shaped to receive the surface of a cylindrical railing.
11. The snow skate of claim 1 comprising a snowboard binding secured thereto.
12. The snow skate of claim 1 wherein the depth of said edges below said base in said second zone of increased edge projection rearward of said flat zone is less than the depth of said edges below said base in said first zone of increased edge projection.
13. The snow skate of claim 2 wherein said second zone of increased edge projection lies generally below the heel of a user's foot when the snow skate is in use.
14. The snow skate of claim 2 wherein the transverse concavity in said second zone of increased edge projection rearward of said flat zone is less than the transverse concavity in said first zone of increased edge projection.
15. A snow skate, comprising an elongated ski body having an upturned front end and a rear end, said ski body comprising:
- a) an upper surface adapted to receive a boot binding for releasably securing a boot to said upper surface intermediate said front and rear ends;
- b) a base surface having a central generally flat zone and a zone of increasing edge projection forward of said flat zone; and
- c) longitudinal edges extending along opposed sides of said base surface;
- wherein the depth of said edges below said base increases continuously in a forward direction in said zone of increasing edge projection forward of said flat zone and wherein a tangential angle is formed at a selected distance forward of said flat zone by said base surface with a transverse horizontal line extending between corresponding lowermost points on said opposed longitudinal edges at said selected distance forward of said flat zone and wherein said tangential angle formed by said base surface with said horizontal line in a region adjacent said longitudinal edges increases within said zone of increasing edge projection forward of said flat zone to greater than 45 degrees.
16. The snow skate of claim 15 wherein the length of said ski body is not significantly greater than the length of the user's boot.
17. The snow skate of claim 15 further comprising a snowboard binding secured thereto.
18. The snow skate of claim 15 wherein said tangential angle formed by said base surface with said horizontal line in a region adjacent said longitudinal edges increases within said zone of increasing edge projection forward of said flat zone to greater than 60 degrees.
19. A snow skate, comprising an elongated ski body having an upturned front end and a rear end, said ski body comprising:
- a) an upper surface adapted to receive a boot binding for releasably securing a boot to said upper surface intermediate said front and rear ends;
- b) a base surface having a central generally flat zone and a transversely concave zone of increasing edge projection forward of said flat zone thereby forming a transverse concavity in said base surface forward of said flat zone; and
- c) longitudinal edges extending along opposed sides of said base surface;
- wherein the transverse concavity of said base surface forward of said flat zone increases continuously in a forward direction in said zone of increasing edge projection forward of said flat zone and wherein a tangential angle is formed at a selected distance forward of said flat zone by said base surface with a transverse horizontal line extending between corresponding lowermost points on said opposed longitudinal edges at said selected distance forward of said flat zone and wherein said tangential angle formed by said base surface with said horizontal line in a region adjacent said longitudinal edges increases within said zone of increasing edge projection forward of said flat zone to greater than 45 degrees.
20. The snow skate of claim 19 wherein the length of said ski body is not significantly greater than the length of the user's boot.
21. The snow skate of claim 19 further comprising a snowboard binding secured thereto.
22. The snow skate of claim 19 wherein said tangential angle formed by said base surface with said horizontal line in a region adjacent said longitudinal edges increases within said zone of increasing edge projection forward of said flat zone to greater than 60 degrees.
1802116 | April 1931 | Kinsley |
1886650 | November 1932 | Willard et al. |
3295859 | January 1967 | Perry |
4004355 | January 25, 1977 | Koblick |
4083577 | April 11, 1978 | Ford |
4188046 | February 12, 1980 | Fleckenstein |
4433855 | February 28, 1984 | Wyke |
4705291 | November 10, 1987 | Gauer |
4836571 | June 6, 1989 | Corbisiero |
5193839 | March 16, 1993 | Hannes |
5871224 | February 16, 1999 | Vance |
6352268 | March 5, 2002 | Peart |
20020017771 | February 14, 2002 | McManus et al. |
20060097484 | May 11, 2006 | Walker |
3139119 | April 1983 | DE |
1050324 | November 2000 | EP |
1071142 | August 1954 | FR |
1368152 | July 1964 | FR |
2623724 | June 1989 | FR |
2005-525181 (T) | August 2005 | JP |
9119549 | December 1991 | WO |
Type: Grant
Filed: May 12, 2003
Date of Patent: Mar 31, 2009
Patent Publication Number: 20060097484
Inventor: Curtis G. Walker (North Vancouver, B.C.)
Primary Examiner: Paul N Dickinson
Assistant Examiner: John R Olszewski
Attorney: Seed IP Law Group PLLC
Application Number: 10/514,101
International Classification: A63C 5/00 (20060101); A63C 5/04 (20060101);